Where a <br><br>folding edge is not straight, dimensionally unstable <br>reasons: <br><br>1, the design process is not scheduled or pre-bending process pressure line <br><br>2, the force is not enough nip plate <br><br>3, punch fillet worn or bent asymmetric discontinuity uniformity <br><br>4, the height size is too small <br><br>solution: <br><br>1, design or pre-bending process pressure line <br><br>2, the force to increase the nip <br><br>3, a uniform clearance punch and die, polishing fillet <br><br>4, a height dimension smaller than the minimum limit of size is not
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